Feed collet



Feb. 16, 1937. P. E. NOLAN FEED COLLET Filed July 19, 1955 flvvvcnfbv 1 65 6135 jValaii/ Patented Feb. 16, 1937 2,071,138

UNITED STATES PATENT OFFICE FEED 'OOLLET Peter E. Nolan, Providence, R. I.

Application July 19, 1935, Serial No. 32,272

2 Claims. (01. 29-62) My invention relates to new and useful im- Fig. 3 is a side elevation of the connecting nip- I provements in a mechanism that is particularly ple. adapted for attachment to a feed quill or sleeve Fig. 4 is a side elevation of the adjustment lock of machines such as automatic screw machines, nut.

automatic lathes, or other metal working ma- Fig. 5 is a side elevation of the collet stock 5 chines, an object thereof being to provide an imgripping pad. pr v d f d ll with a ck r ppin p d that Fig. 6 shows a transverse section of the collet may be readily adjusted when slightly worn, and on plane indicated by 6-6 on Fig. 2. quickly replaced when necessary. Referring now to the drawing:

l0 Another object of my invention is to provide In Fig. 1 the operation of the feed quill l in a f ed collet hav an adjustable me a lic p relation to the holding chuck 2 attached to the memb for Co t the Surface of the bar spindle 3 is so well understood as to scarcely re- Stock. and an Outer resilient Sh com quire reference thereto. Briefly, however, Fig. 1 called a 6, for Said D member to afford a shows a conventional type of sleeve or feed quill n t of p ssu of e pa up the ar st I having a collet 4 secured to one end, and a spool 15 A urthe O j i5 i0 D a D for the 5 affixed to the opposite end of said sleeve. oll t, th pad being f u h simp ity in t The yoke 6 is slidably mounted on a bed or other nal desi t at y O Of a multiplicity Of D means so as to permit reciprocation of the sleeve hav Various al Stock pp ng surfac I within the chuck tube 1 and spindle 3. The

Of different cross sectional shapes may be used aming spool 8 is reciprocated by any conven- 20 with the same shell or conetional means, forcing the wedge 9 between the In automatic screw machines, and automatic cammjng levers m and In, which t t t th la h referred to v the ar s o k ise ipp II and H, against the chuck tube shoulder l2. by a f d finger or ll t wh automatically The moving forward of the chuck tube 1 causes vances a given length of bar stock through the the holding chuck 2 t securely grip th bar 25 opened h0 d ng c When the holding chuck stock while the cutting or tool operations are in closes, the collet automatically moves away from progress w t holding chuck 2 grips th the o ding Chuck. Said collet sliding Over the bar stock, the yoke 6 automatically moves rearsurface of the bar stock. The collet is then in a warmy causing t cohet 4 t slide over the position to move forward when the holding chuck face of bar Stock The pindle 3 is held in b 30 opens, to gai advance the Stock through the ings and may be revolved by any suitable means, holding chuck. such as a pulley.

Heretofore it has been found in practice that 2 discloses the collet 4 threadedly com when the pad or tock gripping member of the nected to the feed quill by the nipple IS. The

collet Was not properly machined, When the collet 4 is composed of a shell or cone l6, which 35 rod or bar stock had a plus or minus tolerance houses t i pad n, l k nut l8, and a for a given size, the stock would either not go threaded end of the nipple l5. The pad l8 has between the gripping surfaces Of t D if lugs I9-l9 which slidably engage the grooves he ba St did p Within the gripping $111" 20-40 in the rear or threaded end of the cone 40 faces, the pad would n have gripping tension [6. The cone [6 is made of spring steel and is 40 to properly hold the stock and move it into the substantiauy ylindrical ithi t provide a jaws of the holding chuck. My invention has an working surface for th cylindrical portion of adjustment which will permit the operator to the pad the cone g having oppositely disproperly Set the D Pressure for the particular posed longitudinal slots for substantially two bar stock in the m thirds its length which provide resilient fingers 45 On many jobs it is essential that the Surface of for engagement of the shoulders 2l-2l' against the bar stock is not Scratched in the slightest the outer surface of the bullet nosed finger surdegree- The nicety of adjustment in my collet faces 22-22. When it is desired to more firineliminates this undesirable feature 1y grip the stock 23, shown in dotted lines, it

In the drawing:-- is necessary only to unloosen the lock nut l8 on 50 F 1 is a longitudinal Vertical Sectional View the left-hand threaded nipple 15, turn the cone partly bleken away, 0f the collet attached- I6 the desired amount in the proper direction by the feed quill Within the Spindle use of a wrench on the flattened portions 24-24 Fig. 2 is an enlarged vertical sectional view of the cone l6, and tighten the lock nut [8 against more clearly showing my improved collet. the cone I6. While the resilient fingers of the 55 cone l6 are substantially rigid, the forcing of the pad nose 2222 against the shoulders 2l2l will cause the resilient fingers of the pad ll, which is of a softer metal, to move toward each other, thereby creating the desired pressure of stock gripping surfaces i3-I3 upon the bar stock 23. It will be observed that the resilient fingers of the cone overlap the nose end of the pad, and place the pressure of the shoulders on the pad nose at the most desirable point of leverage.

The pad I! has lugs l9-!9' thereon, said pad being longitudinally slotted similar to the cone I6. The lugs on the pad slidably engage the grooves of the cone and hold the longitudinal slots of the cone and the pad in fixed axial alinement as shown in Fig. 2, to maintain the even pressure of the stock gripping surfaces upon the bar stock when the collet moves along the surface of said bar stock, by preventing the pad from revolving within the cone. While I have found the groove and lug arrangement advantageous, the collet may be made without employing this means, or may be substituted by other alignment means.

Modifications may be and may become obvious to those skilled in the art, and I do not desire, therefore, to limit my invention except by the scope of the subjoined claims.

Having thus described my invention, What I claim is new and desire to secure by Letters Patent of the United States, is

1. A feed collet comprising a single stock engaging member having slots extending from one end thereof to form a plurality of resilient stock gripping fingers, a resilient fingered housing surrounding said stock engaging member, said stock gripping member and said housing being respectively externally and internally tapered at their slotted ends to provide cooperating wedging surfaces, and means for adjusting the longitudinal position of said stock engaging member relative to said housing to control the contact between said collet and stock being fed therethrough.

2. A feed collet comprising a single stock engaging member having slots extending from one end thereof to form a plurality of resilient stock gripping fingers, a resilient fingered housing surrounding said stock engaging member, said stock gripping member and said housing being respectively externally and internally tapered at their slotted ends to provide cooperating wedging surfaces, means comprising longitudinal internal slots in said housing and engaging radial external lugs on said stock engaging member for holding said members against relative rotation, and means for adjusting the longitudinal position of said stock engaging member relative to said housing to control the contact between said collet and stock being fed thereby.

PETER E. NOLAN. 

